Malicious PDF — malware analysis report

Static analysis result for SHA-256 d90b12d67549ffd2…

MALICIOUS

PDF

34.2 KB Created: 2020-04-07 07:02:27 +03:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: c10b4f3a7de62a26bd088aa1bdb2ce8a SHA-1: 4b6bb1c98cb8b7f4482f3a05baa4bee2e99fbcd2 SHA-256: d90b12d67549ffd27a825a37f0c5d2abf845d522ca3f16b5c360cba1d53a0e61
92 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF document contains a large number of external links, a common tactic for SEO spam or phishing campaigns. The document body, though heavily obfuscated, contains references to 'elements compounds mixtures worksheet tes', suggesting a lure to educational content. The ML classifier strongly indicated maliciousness, and the PDF_SEO_LINK_FARM heuristic confirms the presence of a link farm. No scripts were extracted, limiting the analysis of direct payload delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 3

  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL http://southernsecretsatmears.com/uploads/1/3/1/4/131407405/131407405.html#elements+compounds+mixtures+worksheet+tes
    • http://hindimovies.guru/uploads/1/3/0/6/130639939/xabunujikigokum-wukujaluvirir.pdf
    • http://saskatchewanwhitetailoutfitter.com/uploads/1/3/1/4/131483371/619b76bf.pdf
    • http://digitalradiography.co/uploads/1/3/0/5/130544379/bukobo-kuworiw-paxenoziwi-noneme.pdf
    • http://mysterytomb.com/uploads/1/3/1/0/131070325/bdf411a98c8.pdf
    • http://faustsfolly.com/uploads/1/3/0/5/130539738/gimesigutixuta_powot_netowesozadomu_petukew.pdf
    • http://josephvalenzuela.com/uploads/1/3/0/2/130272241/vareretotonobig.pdf
    • http://sellmy.ca/uploads/1/3/0/6/130639544/zumig.pdf
    • http://xtremetreeservicellc.com/uploads/1/3/1/3/131380723/992c06.pdf
    • http://thetrustygavelauction.net/uploads/1/3/0/7/130739024/wenogode.pdf
    • http://completecoveragefootball.com/uploads/1/3/0/6/130639146/1504764.pdf
    • http://ridemchorses.com/uploads/1/3/0/7/130740078/wulid_tazekugenen_velakepixububi_lijobu.pdf
    • http://cindarcompleteremodeling.com/uploads/1/3/0/4/130483043/f0516702c.pdf
    • http://soulpromotions.com/uploads/1/3/0/3/130379219/2c46d033dd9.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00005e82.bin
cba8f333c0639cde2fec71e9d90aba5ed4452e6e765640133fcabe360aaf3926		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5E82 7472 bytes

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